Battery unit and control method thereof
A technology of battery unit and control method, which is applied in the direction of electrical components, battery overheating protection, battery circuit devices, etc., and can solve the problem that the battery cells cannot be fully charged, the capacity of the battery cluster is not fully utilized, and the capacity of the battery cluster is not fully utilized, etc. problem, to achieve the effect of reducing the degree of imbalance and making full use of
Pending Publication Date: 2021-11-05
SUNGROW POWER SUPPLY CO LTD
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[0004] For example, the normal operating voltage range of a lithium iron phosphate battery is 2.7V to 3.65V. During the charging process, if the voltage of a cell reaches 3.65V, the current will be cut off immediately, and other cells in the battery cluster cannot be fully charged. capacity is underutilized
When discharging, the cell with the least capacity in the battery cluster is discharged to 2.7V at the earliest, then the discharge current of the battery cluster is cut off, and the power stored in other cells in the battery cluster that has not reached 2.7V cannot be released, and the capacity of the battery cluster is not sufficient. use
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[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0051] In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "com...
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The invention provides a battery unit and a control method thereof. The input end of each power converter is connected with a corresponding power supply; the output end of each power converter is connected with a corresponding battery string in series to form a corresponding series branch; and therefore, the voltage of each series branch can be adjusted through the output of each power converter, and the unbalance degree among the battery strings in the operation process is reduced, so that the capacity of the battery unit is fully utilized.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a battery unit and a control method thereof. Background technique [0002] The traditional battery cluster is composed of multiple batteries in series or multiple battery modules PACK in series; taking the battery as an example, its structure is as follows figure 1 shown. [0003] Due to the difference between the capacity and SOC (State of Charge, battery state of charge, also known as the remaining power) of different batteries, and the voltage working range of the battery is generally a fixed range, the batteries in the battery cluster are connected in series, so in In the process of charging the battery cluster, there must be a cell that reaches the upper voltage limit ahead of time. At this time, the charging current must be cut off to stop charging the battery cluster. Then there must be cells in the battery cluster that are not fully charged, and the capacity ca...
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IPC IPC(8): H02J7/00H02J7/06H01M10/42
CPCH02J7/0014H02J7/0048H02J7/005H02J7/007182H02J7/007192H02J7/00309H02J7/0029H02J7/06H01M10/42H02J2207/20Y02E60/10
Inventor 曹仁贤方日周俭节曹伟徐清清
Owner SUNGROW POWER SUPPLY CO LTD